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Alginate fibers cationic dye adsorption studies

Author: GuoChunXiang
Tutor: XiaYanZhi
School: Qingdao University
Course: Materials Science
Keywords: alginate acid fiber dyes batch adsorption column adsorption adsorption model
CLC: X703
Type: Master's thesis
Year: 2011
Downloads: 102
Quote: 1
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Abstract


China owns vast sea areas and is rich in marine biological resources, especially in algae resources. In addition to natural sea algae products, nowadays the technology of culturing algae has been matured. In our country, the outputs of alginate top first in the world and is applied intensively. There are abundant of carboxyl and hydroxyl groups in alginate molecule, and the hydrogen ions of the groups are tend to lose in aqueous solution and hence the alginate fibers bear negative charges. The negative charged fibers are easy to combine positive substance. The alginate fibers manufactured through wet spinning with sodium alginate as raw material is a kind of green marine material, showing comprehensive advantages, such as large specific areas, fast adsorption, easiness to handle and operate, and biodegradation after adsorption, which avoids the environmental pollution.The alginate fibers are made in our laboratory and used as biological adsorbent and its adsorption behavior of dyes are investigated; especially adsorption process of methylene blue dye (MB), cationic blue dye (CB) and dynamic adsorption of methylene blue dye (MB) onto alginate have been studied.In the study of adsorption behavior of methylene blue dye (MB) and cationic blue dye (CB), variables such as time, concentration of solution, pH and temperature are investigated. The isothermal models (Langmuir model, Freundlich model and Temkin model) and kinetic models (pseudo-first-order kinetic model, pseudo-second-order model and Intraparticle diffusion model) and thermodynamic model are applied to further study the adsorption process and mechanism. The studies show the alginate fibers adsorption of both MB dye and CB dye reach equilibrium in a few minutes and adsorption capacity varies little as time extends. The optimal pH of both dye solution is 7. The adsorption capacity increases and the time required for equilibrium adsorption decrease as the concentration of dye solution within experimental range. The adsorption capacity decreases as temperature increases. The adsorption process accord with Freundlich model, Temkin model, pseudo-first-order model and Intraparticle diffusion model, which indicate that alginate fibers adsorption of both dyes is not a monolayer adsorption and the surface of the fiber is not uneven and the adsorption surface energy of the fibers is not homogenous. The negative adsorption valuesΔG show the adsorption process of both dyes is spontaneous. The negative values ofΔH indicate the adsorption process is exothermic and the negative values ofΔS show the randomness of the adsorption system decreases. In the study of dynamic adsorption behavior of methylene blue dye (MB), the effect of time and concentration of dye solution are investigated and the Thomas model and Nelson-Yoon model are applied. The study shows that the adoption behavior of alginate fibers column exhibits obvious dynamic column adsorption characteristics. The adsorption curves accord with the Thomas model and Nelson-Yoon model with high correlation coefficients.

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